Identification of asymmetric current fluctuations in small systems

Paneni, Carlo, Searles, Debra J. and Rondoni, Lamberto (2006). Identification of asymmetric current fluctuations in small systems. In: Proceedings of the 2006 International Conference on Nanoscience and Nanotechnology, ICONN. International Conference on Nanoscience and Nanotechnology, Brisbane Australia, (407-410). Jul 03-07, 2006. doi:10.1109/ICONN.2006.340713


Author Paneni, Carlo
Searles, Debra J.
Rondoni, Lamberto
Title of paper Identification of asymmetric current fluctuations in small systems
Conference name International Conference on Nanoscience and Nanotechnology
Conference location Brisbane Australia
Conference dates Jul 03-07, 2006
Proceedings title Proceedings of the 2006 International Conference on Nanoscience and Nanotechnology, ICONN
Place of Publication Piscataway NJ, United States
Publisher I E E E
Publication Year 2006
Sub-type Fully published paper
DOI 10.1109/ICONN.2006.340713
ISBN 9781424404520
1424404525
Start page 407
End page 410
Total pages 4
Collection year 2006
Language eng
Formatted Abstract/Summary
Theories of stochastic dynamics often used to model the behavior of mesoscopic and nanoscale systems predict temporal asymmetry in fluctuations of their properties when such systems are out of equilibrium. For example, in a system where a fluctuating current is produced, the way the current rises is different to the way in which it falls. Since mesoscopic systems can be considered as a collection of microscopic systems, we are led to ask: is this a fictitious effect of stochastic models, or does this asymmetry in the fluctuations even occur in more fundamental molecular level models, which are deterministic and reversible? Here we provide clear numerical evidence that asymmetric fluctuations do occur in nonequilibrium steady state molecular dynamics. In previous work, we observed fluctuations with asymmetric behavior in a microscopic system of particles undergoing Couette flow. We now extend our observations to a microscopic system of particles subject to color field, to verify that the presence of asymmetry in fluctuations holds more generally for reversible microscopic samples of matter out of equilibrium.
Keyword Molecular dynamics simulations
Fluctuations
Onsager-Machlup theory
Microscopic systems
Nanoscale systems
Transient time correlation function
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ

 
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